Sol-Gel Combustion Synthesis, Crystal Structure and Luminescence of Cr3+ and Mn4+ Ions in Nanocrystalline SrAl4O7

A series of strontium dialuminate SrAl4O7 nanopowders with the grossite-type structure doped with chromium and manganese ions were synthesized by the combined sol–gel solution combustion method with use of two different strontium salts. The Cr3+ and Mn4+ ions concentrations were varied from 0.05 to 5 at.%. Evolution of phase composition, crystal structure, and microstructural parameters of the nanocrystalline materials depending on the synthesis conditions, temperature of thermal treatment, and dopant content were investigated by the X-ray powder diffraction and the scanning electron microscopy techniques. Photoluminescent properties of SrAl4O7 nanophosphors activated with Cr3+ and Mn4+ ions were studied at room temperature. The samples exhibit typical photoluminescence in the deep-red spectral region, corresponding to d-d transitions in Cr3+ or Mn4+ ions. The intensity of this deep-red emission is dependent on the dopant concentration and annealing temperature. Features of the formation of octahedral surroundings around Cr3+ or Mn4+ ions are discussed.

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Hydrazine and Urea Fueled-Solution Combustion Method for Bi2O3 Synthesis: Characterization of Physicochemical Properties and Photocatalytic Activity

BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS ◽

10.9767/bcrec.15.1.5483.104-111 ◽

2019 ◽

Vol 15 (1) ◽

pp. 104-111 ◽

Cited By ~ 2

Author(s):

Yayuk Astuti ◽

Prisca Putri Elesta ◽

Didik Setyo Widodo ◽

Hendri Widiyandari ◽

Ratna Balgis

Keyword(s):

Crystal Structure ◽

Photocatalytic Activity ◽

Bismuth Oxide ◽

Rhodamine B ◽

Combustion Method ◽

High Photocatalytic Activity ◽

Synthesis Process ◽

Solution Combustion ◽

Solution Combustion Method ◽

Structure Morphology

Bismuth oxide synthesis using solution combustion method fuelled by hydrazine and urea has been conducted. This study aims to examine the effect of the applied fuels, urea and hydrazine, on product characteristics and photocatalytic activity in degrading rhodamine B dye. Bismuth oxide synthesis was initiated by dissolving bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) in a nitric acid solvent. Fuel was added and then stirred. The solution formed was heated at 300 ºC for 8 hours. The product obtained was then calcined at 700 ºC for 4 hours. Bismuth oxide synthesized with urea (BO1) and hydrazine (BO2) as fuels both obtained form of yellow powder. The formation of bismuth oxide is indicated by the vibrations of the Bi–O–Bi and Bi–O groups and the crystal structure of a-Bi2O3 in both products. Photocatalytic activity test showed that BO1 has a photocatalyst activity in degrading rhodamine B higher than that of BO2 with constant values of 3.83×10-5 s-1 and 3.43×10-5 s-1, respectively. The high photocatalytic activity can be examined through several factors, such as: band gap values, crystal structure, morphology, and surface area, acquired as a result of the use of different fuels in the synthesis process. Copyright © 2020 BCREC Group. All rights reserved

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Stark sublevels in Tm3+–Yb3+ codoped Na2Y2B2O7 nanophosphor for multifunctional applications

RSC Advances ◽

10.1039/c4ra15891a ◽

2015 ◽

Vol 5 (44) ◽

pp. 34999-35009 ◽

Cited By ~ 78

Author(s):

Abhishek Kumar Soni ◽

Riya Dey ◽

Vineet Kumar Rai

Keyword(s):

Crystal Structure ◽

Combustion Method ◽

Optical Devices ◽

Biological Applications ◽

Solution Combustion ◽

Solution Combustion Method

The phase and crystal structure of the Na2Y2B2O7:Tm3+–Yb3+ inorganic phosphor prepared by solution combustion method have been identified. These observations show that the developed material can be used in optical devices and for biological applications.

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Effect of Bi3+ ion concentration on crystal structure and luminescent properties of blue–green-emitting Y2O3:Bi3+ phosphors

Functional Materials Letters ◽

10.1142/s1793604720500368 ◽

2020 ◽

Vol 13 (07) ◽

pp. 2050036

Author(s):

Qian Li ◽

Biao Zhang ◽

Zhilei Wei ◽

Miao He ◽

Hailong Wang ◽

...

Keyword(s):

Crystal Structure ◽

Emission Spectra ◽

Luminescent Properties ◽

Combustion Method ◽

Ion Concentration ◽

Solution Combustion ◽

Solution Combustion Method ◽

Light Emitting ◽

Broadband Emission ◽

White Light Emitting Diodes

Blue–green-emitting Y2O3 : [Formula: see text]Bi[Formula: see text] ([Formula: see text] = 0.25–1.50 mol.%) phosphors were synthesized by a solution combustion method followed by high temperature annealing. The effect of Bi[Formula: see text] ion concentration on the crystal structure and photoluminescence performance of the phosphors were investigated. The results show that the cell parameter and cell volume of Y2O3host were increased with the Bi[Formula: see text] concentration, and all the phosphor powders exhibited porous lamellar structure with the width of [Formula: see text]500 nm. The emission spectra of the phosphors ([Formula: see text] = 335 nm) consist of three broadband emission spectra centered at 370 nm (3A[Formula: see text]A[Formula: see text], 410 nm (3E[Formula: see text]A[Formula: see text] and 486 nm (3B [Formula: see text]A), respectively. The phosphor exhibited the optimal luminescence performance at [Formula: see text]= 0.50% and the dipole–dipole and quadrupole–quadrupole interactions among Bi[Formula: see text] ions could lead to the concentration quenching. The color coordinates of Y2O3:0.50%Bi[Formula: see text] were (0.1595, 0.2250), indicating that the as-synthesized blue–green phosphors have a broad application prospect in the field of white light-emitting diodes.

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Preparation of TbBO3 Powder and Growth of TbBO3 Crystal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.306-307.416 ◽

2011 ◽

Vol 306-307 ◽

pp. 416-422 ◽

Cited By ~ 4

Author(s):

Li Li Cao ◽

Yi Yong Chen ◽

Chan Juan Lin ◽

Ze Bin Shen ◽

Fei Yun Guo ◽

...

Keyword(s):

Crystal Structure ◽

Magnetic Susceptibility ◽

Sol Gel ◽

Combustion Method ◽

Hexagonal Structure ◽

Solid State Method ◽

Gel Combustion ◽

Ft Ir ◽

State Method ◽

Gel Combustion Method

Triclinic and hexagonal structure of TbBO3 was synthesized by Sol-Gel combustion method and high temperature solid state method respectively. The TbBO3 crystal was grown by fluxing Czochralski(CZ) method and LiBO2 as flux. The crystal structure was studied by FT-IR and DTA. The results of powder magnetic susceptibility of hexagonal one showed that TbBO3 may be a good candidate magneto optical material.

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